Reply To: block K5 listening UDP PUBLIC port using iptables – how?

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January 26, 2016 at 6:19 am #52722

hvgsit
Participant

Just found your post and had the same issue.

What worked for me was the following firewall rules done in the web interface in the INPUT chain

ppp0 * REJECT tcp opt — in ppp0 out * 0.0.0.0/0 -> 0.0.0.0/0 tcp dpt:749 reject-with icmp-port-unreachable
ppp0 * REJECT udp opt — in ppp0 out * 0.0.0.0/0 -> 0.0.0.0/0 udp dpt:88 reject-with icmp-port-unreachable

Confirmed working on external ip with

nmap -p749 -sUT x.x.x.x

and

nmap -p88 -sUT x.x.x.x